- orchialgia
- orchidalgie
- orchidoepididymectomia
- orchidoncos
- orchiektomie
- orchiepidymitis
- orchiodynia
- orchioneuralgia
- orchiopathia
- orchiopexis
- orchitida
- orchitis
- orrhomeningitis
- orthomorphia
- ortomyxovir
- ortopedie
- ortorentgenogram
- ortostatická intolerance
- oscheitis
- oscheocarcinoma
- oscheoma
- osphyalgia
- osphyarthritis
- osphyitis
- osphyomyelitis
- ossiculectomia
- ost(e)algia
- ost(e)itis
- ostempyesis
- osteoarthrotomia
- osteoartitida
- osteoartróza
- osteoartróze, osteoarbrosa
- osteoblastoma
- osteoclastoma
- osteocopia
- osteocystoma
- osteodynia
- osteofibroma
- osteochondroma
- osteochondropathia
- osteochondrosarcoma
- osteolipoma
- osteom
- osteoma
- osteomyelalgia
- osteomyelitida
- osteoneuralgia
- osteopathia
- osteophyma